Apparatus for and the cooling of annealed goods in cooled vessels



Jan. 31, 1933. 7 1-1. PRUFERT 1,395,680 APPARATUS FOR AND THE COOLING OF ANNEALED GOODS IN COOLED VESSELS Filed Oct. 25, 1929 FT Q1 11 I i 1 1 1 1 E I 1 1 1 I Patented Jan. 31, 1933 UNITED STATES" PATENTOFFICEY I HERMANN rm'irnn'r, or HOHENLIMBURG, G RMANY APPARATUS FOR AND THE COOLING- F ANNEALED GOODS IN COOLED VESSELS Application filed October 25, 1929, Serial No. 402,445, and in Germany March 22; 1928.

An application has'been filed in Germany March 22, 1928. i

Commencing with the supposition that it is known that in the ordinary annealing process oxidation of the material takes place after its removal from the furnace a treatment and a device are hereinafter explained with the aid of which by the exclusion of the atmospheric air after annealing scaling of the material is prevented.

Fig. 1 represents a sectional viewof my apparatus. h

Fig. 2 shows a modification of the apparatus in Fig. 1 and is also in section.

To this end the material heated in the annealing furnace to its maximum temperature (represented in Fig. 1 of the accompanying drawing as an annealing box a containing cold rolled strip iron heated from 67 00 C.) is inserted in the cylindrical receptacle 6.

This receptacle 7) issituatedin a further receptacle 0 which is filled with a slowly combustible'liquid d (oil). In order to avoid boiling of this liquid quantity employed as packing medium a water-cooled pipe'coil e is arranged to surround the receptacle 6. For the purpose, moreover, of preventing the receptacle 7) from floating in the liquid referred to it is weighted by a counter weight f. If now after the airing cock it has been closed a sheet metal bell 9 indicated by hatched lines is introduced into the receptacle 0, the charge a is thereby subjected to a hermetic closure. The air still contained in the bell g which would have access to the heated rmerial and accordingly cause oxidation is rendered harmless by the addition to the charge shortly prior to the placing of the bell g of a suitable readily combustible sub- 0 stance (for example petroleum) which after the insertion of the bell g extracts the noxious oxygen from the closed air by subsequent combustion. 7

Consequently in the closed space a gas mixture is generated which as regards the charge exhibits a neutral behaviour." The 7 bell 9 due to is own weight and reduction of space as a result of the combustion process will be caused to sink in the packing liquid d down to a certain extent. Conj ointlywith 5; this the gas mixture formed will be heated by the charge a resulting in an expansion of the gases whereby the hell 9 is forced to rise.- Now at the lower edge of the bell 9 there are four openings i which in the rising movement of the bell g reach the liquid level providing a regulated exit for the expanding gases, The result is that the bell 9 will always tip with its lower edge in the liquid being balanced without lateral sway. When the expansion of the gas mixture is terminated so that the heating has reached its maximum a fall of pressure and consequential reduction .of space will gradually set in in the interior by the cooling of the charge a and the bell 9 will sink. The dimensions of the hell are dependent on the volume and charging temperature of the charge a so that after the cooling ofthe gas mixture a floating of the bell g is rendered'possible in the low position. When this position is attained the airing cook it is opened in order to prevent the liquid column d between the bell g and the receptacle 6 from being drawn up and the bell 9 can be removed and consequently the charge be taken from the receptacle.

Another manner of application of the ar rangement described shall hereinafter be explained.

After the cock h is opened and agas genso 'erating substance has been added. tothe charge a (for example gas coal) which readily ignites, the bell g is placed in position". Combustion takes place of the oxygen contained in the receptacle and the bell g sinks to '85 its low position resting with its bottom on the edge of the receptacle 6. I The cock k is now closed and after the oxygen in the interior is bound up gasification sets in of the incompletely burnt-gas driving medium result-ing in a rise of the bell g. The neutral gas formed in the raised bell g is 'further heated by the charge a until an outflow takes place in the highest position of the hell 9 by way of the ports 2'. The cooling setting in thereafter results as already mentioned in the preceding process in a descent of the bell 9 until the cooling is e'fiected. The charge a may then be removed as already described after the. cook it has been opened and the bell 9 taken off.

According to Fig. 2 a receptacle 6 instead of being surrounded with a cooling 'coil 6 may be equipped with a cooling jacket 70 adapted to separate the Wallof the, receptacle b circumferentially "completely trom' the packing liquid, d preventing the latter therefore from becoming excessively heated.

Arranged. within the jacket is by preference a cylindrical partition Z which is closed at the bottom and open at the top m; By this partition the jacket is divided into an outer and an'inner' cylindrical portion. Arranged in the outer portion. moreover are helical 4 guide-vanes n. By these guides the gaseous or liquid cooling medium admitted by Way of the conduit 0 is caused to flow along the helical path upwardly in the outer portion of the jacket and then at the upper edge through the openings m to the inner portion of the jacket downwardly leaving at the lower end by way of a socket 10. The gaseous or liquid cooling medium prevents the heat emanating from the charge 0; from excessively heating the packingliquid d since it forms circumferentially a 'comple te'separation between the charge and the liquid. 7

I claim: 7 4 r '1. Process for cooling heat-treated mate? rial which consists in placing the material while in highly heated condition in a recep ta'cle enclosed within a double-walled vessel, the space between the walls of'which is filled with a liquid of high boiling point, inverting an open-ended vessel over said receptacle, the open end of said vessel being immersed in I the liquid thereby to form aseal, adding-Ito I verted vesselto atmospheric communication.

the heat-treated materiala combustible fuel thereby to neutralize any air within the inverted vessel and cause said vessel to move upward to permit escape of excess gas, allow-' ing said inverted vessel to sink in said liquid in proportion to the gradual equalizationof the temperature within and without the material-containing receptacle until the open end of the inverted vessel reaches the bottom of the. cooling receptacle, and opening the in? 2. Processior the cooling of heat-treated material which consists in placing the material whilein highly heated condition in a receptacle together with a gas generating medium, enclosing said receptacle in a doublewalled vessel, the space between the walls of which is filled with 'a liquid having a hig h boiling point, inverting an open-ended vessel over the heat-treated material and immersing the open end of said vessel in said liquid thereby to form a hermetic seal, establishing atmospheric communication with the interior of the vessel above said liquid to allow the vessel to sink by gravity into the liquid until the open end of said vessel reaches the bottom of the material-containing receptacle, discontinuing said atmospheric communications thereby to cause consumption of the oxygen of the inclosed air by the combustion of the gas-generating medium and causing the vessel tobe raised by the unburned products otthe gas-generating medium and the heating of the neutral gas so as the coolingolf ofthe heatrtreated material,

and after the complete cooling of the material again establishing atmospheric communication with the interior of the vessel thereby to permit ready removal thereof.

3. Apparatus for cooling annealed mate rial, comprising a container having a plurality of concentrically disposed spaced-apart walls, a vessel disposed centrallyof said container for receiving the material to be cooled, the space between two of the walls of said container being filled with a slowly combustible liquid, and-a vertically movable bell having its open end immersed in said liquid thereby to form a liquidseal for said vessel, said bell being of a height approximately equal to that of the liquid container whereby the bell will be free to rise and fall within the liquid container in response to the pressure and expansion of the gases therein while maintaining said liquid seal throughout said movement, said bell being provided with perforarations above the level ofthe liquid in; the

container. o i

Apparatus for cooling annealed mate: rial, comprising a triple-walled" container havingits walls spaced apart thereby toformbetween them a pair of concentric annular spaces, a, vessel disposed centrally of said container for receivingthe material to be cooled," the space between the outermost wall and the centerwall of the container being filled with aslowly combustible'liquid ,"a' lindrical partition disposed approximately midway between said center wall and the innermost'wall of the container, saidpartition.

being of slightly less height than the-Walls of the container thereby to divide the space between said walls into a pair of annular spaces communicating at their upper end, a conduit V communicating with the lower end of the outer one of said annular spaces,means disposed 1n said outer annular spacefor directing a coollng medium from said conduit. up.-

ward and into the inner annular space, and a vertically movable bell having its open end immersed in said liquid thereby to form a liquid seal for said vessel, said bell being of a height approximately equal to that of the liquid container whereby the bell will be free to rise and fall within the liquid container in response to the pressure of the gases therein, while maintaining said liquid seal throughout said movement.

In testimony whereof I have signed my name to this specification.

HERMANN PRI TFERT. 

